بابک عبازاده

This paper performs such fracture analysis for an orthotropic hollow cylinder coated by a magneto-electro-elastic (MEE) layer under torsion. The orthotropic hollow cylinder contains several arbitrarily shaped cracks. A uniform electric displacement and magnetic induction are applied on the outer boundary of the MEE coating. At first, the displacement and stress components of the coated hollow cylinder weakened by a Volterra-type screw dislocation are found as a function of the dislocation density through Fourier transform. Next, distributed dislocation technique (DDT) is used to simplify the stress components corresponding to the screw dislocation to a set of Cauchy singular integral equations. The singular integral equations are subsequently solved through a numerical procedure to obtain the unknown dislocation density. Next, the stress intensity factors (SIFs) and the torsional rigidity in the cracked hollow cylinder with its MEE coating are found in terms of the dislocation density function. Several numerical results of the SIFs and torsional rigidity are provided to reveal the effects of the geometrical and physical parameters on fracture behavior. It is concluded that the SIFs can be minimized using suitable values of the electric displacement and magnetic induction.